Safety operating mechanism.



E. M. HAWKINS.

SAFETY OPERATING mncmmsm.

APPLICATION FILED JULY 1914.

Patented Mar. 23, 1915.

.3 SHEETS-SHEET 1.

awventoz E. M. HAWKINS.

SAFETY QPERATING MECHANISM.

APPLICATION rum) JULY 15, 1914.

Patented Mar. 23, 1915.

3 $HEETS-SHEBT 2.

E. M. HAWKINS.

SAFETY OPERATING MECHANISM.

APPLICATION FILED JULY 15, 1914.

Patented Mar. 23, 1915.

3 SHEETS-811E121? 3.

i STATES PATENT OFFIGE.

EDGAR M HAW KINS, OF ROCHESTER, NEW YORK, 'ASSIGNOR TO M. D. KN OXVLTON COMPANY, OF ROCHESTER, NEW YORK. A CORPORATION OF NEW YORK.

SAFETY OPERATING MECHANISM.

To whom 'it may cohce'r'n Be it known that I, EDGAR M. Hawkins, *citizen of the'United States, and resident of *Rochesterfin the county of Monroe and "Stateof New York, have invented certain new and useful Improvements in Safety Opera-ting Mechanism, of which the followis a specification.

' is invention relates to operating mecha'iiism for punchiiig machines, presses, boxstayiiigmachines and tlie'like, and has for it's-object to provide a novel safety operating mechanism of such character as to render the work-performing element of'the machine effective only when it is proper that'the same should be effective. In other words, if an'ob'str'uctioii, such as the operators 'han'tl or'any other part of his body, lies in the path of the work-performing elemerit, the operating mechanism will not im- T part an eifective'wo'rking stroke to theworkperforming element. The operators safety is thus assured, as there is no danger of i ijury'frs'm the work perforniihg parts.

I In furtherance of this object, the invention consists in providing a collapsible link or pitman between the work-performing element of the machine and the actuating means therefor. The collapsible link or pitina'n consists of two relatively movable members which are normally adapted to telescope or move relative to each other when an obstruction, other than the work to be operated upon, lies in the path of the workperforming element. Means is provided, however, for rendering the parts of the pit- :man rigid just prior to the engagement of the work by the work-performing element Qoneach stroke, and if no obstruction is en countered, the work is, therefore, properly acted upon. This means preferably takes the form of an element which is shifted during the movement of'the pit-man to posi- -tively connecttherelatively movable parts of the pitman and thereby render said parts rigid and non-collapsible. v

r The invention further consists in providing means for protecting said sliiftable element against accidental movement and thereby preventing shifting of the same until the'proper time. 4 v

. e invention also consists in certain other noveljfeatiires, which will hereinafter be "described,

Specification of Letters Patent. P t t M n 23 1 Application filed July 15, 1914. Serial No. 851,069.

The'invention is illustrated in the accom-' panying drawings, in which Figure l is a front elevation of'the collapsible pitm'an or link,'a'nd certain parts adapted cooperate therewith; Fig. 2 is a side elevation of the construction show'n'in Fig. 1'; Fig. 3 is'a front elevation of a'b'o'x staying machine showing the collapsible pitman applied thereto; Fig. 4 is a side ele-. vation'of the construction shown in -Fig.- 3; Fig. 5 is a sectional view taken on the line 55 of Fig. 2; Fig. 6 is a sectional view taken on the line 66 of Fig. 5; Fig. 7 is a sectional view taken on 'the line 7- 7 of Fig. 6; and Fig. 8 is a vertical section taken on line 8-8 of Fig. 7.

Similar reference characters indicate like parts in the several figures of the drawings.

The collapsible pit'm'an or link, 'lie'reinbefor'e referred to, comprises relatively movable parts A and B. The pm A is adapted to'telescope within th'epa'r't B, but is normally retained in'thepO'SitiOn shown in the drawings by means 'of'th'e longitudinally slidable plugs I, mounted in cylindrical openings or bores'for'ined in tlieou't'er member B. Theinner ends of'the plug '1 are provided with the projections 2 presenting an inclined cam face'3 attliei'r' upper surface, and a horizontally disposed check face or stop face 4 at their-under surface. These projections 2 are adapted to engage in correspondingly formed recesses 5, (Fig. 6), formed in the inner 'fi'ienibei A. The slidable plugs l are spring-pressed and'are held in the position shown in Fig. 1, preferably by means of the leaf-springs 6 secured to the side portions of 'tli'eoute'rinihv ber B, and engaging at their i' pperextremities, the slidable plugs 1. 'The upper 'eX- treinities of the springs '6 "are sl0tted,"--as shown at 7, to e gage rojectingf o tioiis 8- on the slidable plugs 1. The plugs l a'i'e therefore spring-pressed-tow'ard the "m'e'i'nher A, and the strength of the springs 6 is such that the parts will normally r'etain'the position shown in Fig. 1'. fIn'other'words, T if the part B, or anypartwhi'ch it operates,

meets with no obstruction during its movemerit, the part A will actuate the p'art'Bi the same manner as if thetwow'ere rigidly conhe'cted. 'If the moveinentof'the part B is resisted, however, "thep'art A, indes'cendmg, will .a'ct upon the cam faces, 3 of the shown in Figs. 1, 5 and 7. The

plugs 1, thereby forcing the plugs out- Wardly and permitting the parts A and B to telescope or to move relatively to each other, due to the fact thatthe part A will further descend without moving the part B.

Pivotally associated with the lower part B of the collapsible link is a pivoted dog 9 forconnecting the relatively movable parts A- and B when the work-performing elementnears the end of its working stroke. This dog 9 consists of a vertically disposed arm 9', and a horizontally disposed arm 9". The normal position of the dog 9 is that shown in Fig. 2, in which the vertically disposed arm 9 is in alinement with a recessed or cut-out portionlO, formed at the lower extremity of the upper member A of the or pitman. The horizontal portion 9' of the dog 9 rests upon a lever 11 pivotally connected to the part B at 12,. (Fig. 1), and positioned transversely of the part B, as best outer or: free end of the lever 11 is supported by a pin '13 set in the inner face ofthe member B. The dog 9, therefore, normally has no effect in preventing the collapsing or .telescoping movement of the parts A and B, above described.

The pitman constructed .as described above, may be applied to many different box-staying machines andthe like. In Figs. 3- and 4, the pitman is shown associated with a box-staying machine, in which the upper member A of the pitman is eccentrically connected with the driving shaft C of the machine and the lower member B is 'connected to the sliding head' D, which carries at its lower part the movable dieorjamb E of the staying machine.

Besides thepitman structure hereinbefore described, the safety operating mechanism comprises certain fixed parts, which are preferably carried by an 'auxiliary or inde pendent supporting bracket F, which may besecured to any suitable fixed part of the machine to which-the pitman is applied. In

the present instance, the bracket F is attached to that part of thefraine which carriesfthe stationary die or anvil G'with which the movable die E cooperates in applying a stay to a box corner. Said bracket is prd vided with an upright portion 14 having. a

' f lon gitudinal recess or opening 15 to accomim'od'ate a; longitudinally slidable bolt 16.

This bolt 16 is preferably a T-bolt, having at its lower extremity a cross-piece 17 which supports a casting 18, associated with the lower part of the uprightportion 14 of the frame F. A spring 19, positioned in the opening 15, serves to retain theT-boltin the position shown in'Fig. 8. The part 18.1s

held in proper relation with respect. to the part 14 by-meansof a. dowehpin 20, set in to be. operated ,upon. When the lever 11 thus contacts with the projection 22, the dog .the completionof the stroke such as punches, presses,

. thereby swings roller 27 cooperates with ing 21 of the part 18, whereby said part 18 is permitted to move relative to the part 14, during which movement, the T-bolt will be lowered and the spring 19 compressed.

The part 18 is provided with a projection 22, which lies in the path of the lever 11 and is so positioned, that the lever 11 will con-v tact with the projection-22 just prior to the engagement of the work-performing element E with the work. In practice,it has been found desirable to so position the parts that the projection 22 will act on the lever 11 when the work-performing element E is about one-eighth of an inch from the work 9 is 'swun' to the le in- Fig. 2, thereby bringing t e vertically disposed portion9 directly under a shoulder 23 formed at the lower extremity of the part A. A rigid con-- nection will therefore be established between the parts B and the part A, and the pitman will be rendered effective for transmitting the proper amount of power to the work-performing element to enable .it to properly perform its function. In order that the projection 22 will not interfere with of the pitman after the lever 11 contacts with the projection, the projection'22 and thepart 18 with which it is associated, moves downwardly and compresses the spring 19 in the manner above described. The part 18, therefore,

yields after the dog 9 is thrown under the shoulder 23, but the strength of the spring 19 is such as to cause the dog to be so actu-- ated before the part'18 will yield.

In order to prevent accidental displacement of the dog 9 before it is actuated by' the projection 22, a protecting element 24 is provided, a projection 25 of which nor-. mally overlies the horizontal portion 9 of the dog 9. The protecting element 24 is pivotally connected with the part B at 26, and is held in the position shown in Fig. 2 durin the greater part of the movement of the pitman by means of a roller 27 carried bythe upright part 14 of the frame F. Just 'prior to the engagement of the projection 22 by the lever 11,- a cam surface 28, formed .115

on the part 18, cdacts with the lower extremity 29 of the protecting element .24,- and the same to the right in 'Fig.

2, and releases the'horizontal portion .9" of the dog 9. At this stage of the operation, the inclined portioni30 of the protecting element .24 is adjacent the roller 27 whereby v is permitted the swinging movement ofthe protecting element 24, just described. Af-

ter the protecting element 24 is deflected 2 by the cam surface 28, the dog 9 may be swung under the shoulder 23 by the lever 11- and projection 22, as hereinbefore de-- scribed. On the up stroke of the pitman, the

the inclined Paul ing a corresponding recess to receive said plug extremity to yieldingly resist relative movement of said parts in one direction and to lock said parts a ainst relative movement in the opposite irection, and means automatically operative near the end of the stroke-of the pitman to render the parts thereof rigid and non-yieldable.

7. Safety operating mechanism for machines of the kind described, com rising a pitman having relatively mova le and ylelding parts, a movable element carried by one 0 said lparts, means automatically operative near t e end ofthe stroke of the pitman'to shift said element to render said parts rigid and non-yieldable for the remainder of the stroke, and means'to prevent accidental shifting of said element before said last-named means operates.

8 Safety "efating mechanism for machines of the d described, comprising a pitman havin relatively movable and yielding parts, a pivoted dog carried by one of said parts, means automatically 0 erative near the end of the stroke of t e pitman to shift said do to render said parts rigid and non-yiel able for the remainder. of the stroke, .and means to prevent accidental shiftingofsaid dog before said last-named means operates.

9. Safety operating mechanism for machines of the kind described, comprising a pitman having relatively movable and yiel 'ng. arts, a movable element carried by ac oi said parts? means automatically 0 rative near the end of the stroke of the pitman to shift said element to rendersaid parts rigid and non-yieldable for the re- .mainder of the stroke, protecting means to.

prevent accidental shifting of said element before said last-named means '0 crates, and automatic means to shift sai protecting means to inoperative position to permit the element to be shifted y said means.

10. Safety operating mechanism for machines of the kind described, comprising a pitman having relatively movable and yielding parts, a pivoted dog carried by one of said parts, means automatically operative near the end of the stroke of the pitman to shift said dog to render said parts rigid and non-yieldable for the remainder of the stroke, protecting means to revent accidental shifting of said do be ore said lastnamed means operates, an automatic means i to shift said protecting means to ino said means.

- 11. Safety operating mechanism forma-flnear the end of the stroke of the pitman shift-said. element to render said mit t rative" position to permit the dog to be shifted by amp and non-yieldable for the remainder of the stroke, protectmg means to prevent accidental shifting of said element before said lastnamed means'operates, means to prevent l. shift ng of saldlprotecting means through-' stroke, rotecting means to prevent accidental shi ting of said dog before. said lastnamed means operates, means to prevent shifting of-said protecting means throughout the eater part of the stroke of the pitman, an automatic means to shift said protecting e dog to be shifted y its shifting means.

13. Safety operating mechanism for machines of the kind described, comprisin a pitman having relatively movable and yie dmg parts, a movable elementcarried by one of said .parts, means automatically opera-.

tive near the end of the stroke of the itman to shift said element to render-sai parts rigid and non-yieldable for the remainder of the stroke, and means carried by the pitman to prevent accidental shifting of said eleinent before said last-named means operates.

14. Safet operating mechanism for machines of t e kind. described, comprising a itman having relatively movable and yielding parts, a movable element carried by one means to inoperative osition to perof said parts, means automatically operative near the endof'the stroke of the pitman to shift said element to render said parts rigid and non-yieldable for the remainder of the stroke, protecting means carried by the pitman to prevent accidental shifting of said element before said last-named means opcrates, and automatic means to shift said protecting means to inoperative position to permit the element to e shifted by .said means.

15. Safet operating mechanism for machines of t e kind described, comprisin -a pitman having relatively movable and yie dmg parts, a pivoted dog carried by one of sald' parts, means automatically operative near the endof the stroke of the pitman to shift said dog to render'said parts rigid and non-yielda-ble. for the remainder of the stroke,

stroke, protecting means carriedby the pit man to prevent accidental shifting of said before said lastnamed means operates,

do and aatomatic'meansto shift said protecting means to inoperative position to permit dog before said last named means operates, the dog to be shifted by said means. and automatic means to shift said protect- 16. Safety operating mechanism for maing means to inoperative position to permit 15 chines of the kind described, comprising a the dog to be shifted by said means.

.5 pitman having relatively movable and yield- Signed at Rochester, in the county of ing parts, a pivoted dog carried by one of Monroe and State of New York, this 13 day said plartgdmefanfi automatically operative of July A. D. 1914. near t e en 0 t e stroke of the itman to i shift said dog to render said parts i'igid and EDGAR HAWKINS- JJL non-yieldable for the remainder of the stroke, Witnesses pivoted protecting means carried by the pit- HERBERT W. SPEARES, man to prevent accidental shifting of said THOS. D. PATTON. 

